Service difficulty report · Drive Gear · Cessna 172S

Difficulty date
July 16, 2009
Submitted
August 3, 2009
Operation
General aviation
Make and model
Cessna 172S
Aircraft time
305 hours
Engine
Lyc IO360L2A
Propeller
Mcauly 1A170E
Part
Drive Gear
Part number
PM2401
Condition
Broken
Location
Starter
Part time
641 hours
Component
Starter · Lamar
Component part number
PM2401
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) STARTER BEGAN TO TURN ENG AND STOPPED. NO FURTHER ROTATION WAS OBTAINED. UPON INSP, A BROKEN STARTER DRIVE GEAR WAS NOTED, ALONG WITH A MISSING TOOTH ON ENGINE`S RING GEAR. IT IS NOT CLEAR WHETHER THE BROKEN RING GEAR TOOTH PRECIPITATED FAILURE OR IF THE STARTER DRIVE GEAR STARTED THE TROUBLE, BUT IT IS OF INTEREST TO NOTE THAT MFG ISSUED A LSI-009, DATED 08/12/04, RECALLING A QUANTITY OF THESE PM2401 STARTERS WITH POTENTIALLY DEFECTIVE STARTER DRIVE GEARS. THE SN RANGE GIVEN DOES NOT APPLY TO OUR STARTER.

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